Mannix: Season 7, Episode 18

Walk a Double Line (10 Feb. 1974)

TV Episode  |   |  Action, Crime, Drama
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Joe tries to prove that a young man is innocent of killing his boss in a locked room mystery.


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Episode credited cast:
Rest of cast listed alphabetically:
Hildy Brooks ...
Robert Burr ...
Paul Grant
Davey Davison ...
Cathy Walker
Tom McFadden ...
Steve Walker
Jack Starr ...
Mrs. DeMarco
Ward Wood ...


Joe tries to prove that a young man is innocent of killing his boss in a locked room mystery.

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Release Date:

10 February 1974 (USA)  »

Company Credits

Production Co:

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


When Mannix is standing at his desk in his office, he's holding a manila folder in his hands and is leafing through its contents. The camera then briefly switches to Peggy and then back to Joe but the manila folder has completely disappeared as it's not in his hands and not on his desk anywhere. See more »

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User Reviews

A good episode up until the ending where a key loose end is left unresolved
19 April 2015 | by (Scottsdale, AZ) – See all my reviews

This episode was a pretty good and entertaining one up until the ending, where a key plot point was left unresolved.

It's about an executive who is killed in his office, and Mannix is hired by the wife of the person accused of killing him as she insists he's innocent.

There's a big problem with this episode, though. How were all of the people in the office building able to hear what was being played on the tape recorder?? Unless the sound was amplified in some way, there's no way they could have heard it, even if the volume was turned all the way up on the recorder. No indication was given on the show that the sound had been amplified and no other explanation was provided for this discrepancy, and it was simply left as a loose end. So because of that, I'm giving this show a 7 instead of a 10, which is still pretty good but it could have been a lot better.

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